class 类人猿 {
    void crySpeak(String s) {
      System.out.println(s);
    }
}
class People extends 类人猿 {
    void computer(int a,int b) {
      int c = a*b;
      System.out.println(c);
    }
    void crySpeak(String s) {
      System.out.println("***"+s+"***");
    }
}
public class Example5_10 {
    public static void main(String args[]) {
      类人猿 monkey;
      People geng = new People();
      monkey = geng; //mokey是People对象geng的上转型对象
      monkey.crySpeak("I love this game");
      //等同于geng.crySpeak("I love this game")
      People people=(People)monkey;	//把上转型对象强制转化为子类的对象
      people.computer(10,10);
    }
}
